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If you can see the home screen, push the advance button and select a reboot of the CCP - similar to cycling power to the panel. When the panel boots the memory EEPROM read/write function is very specific. If it reads or writes out of sequence - like in a "brown-out" state (insufficient power or operation outside of its intended environment) then an error will occur. If you still get the write fail error, then I believe you will be replacing the panel.